Sig test for ranges

[Cherilyn Young]

Hi everyone,

What would be the best significance test to see whether one subgroup of a
data set has a significantly greater range of values on a variable than
other subgroups?  From what I've read, a Poisson distribution *might*
work, but I'd instinctively prefer something nonparametric.  I'm working
with a data set of human subjects' responses on cognitive and linguistic
measures, if that helps any.

Thanks in advance,

Cherilyn Young
[EMAIL PROTECTED]